Fluid Mechanics 1 (RCARDS)

Question 1

The stress-strain relation of the Newtonian fluid is

Answer 1

Linear

Question 2

Mercury does not wet glass. This is due to property of liquid known as

Answer 2

Surface Tension

Question 3

The increase of temperature results in

Answer 3

decrease viscosity of liquid

Question 4

The tendency of a liquid surface to contract due to the following property:
A. viscosity
B. surface tension
C. adhesion
D. cohesion

Answer 4

Surface Tension

Question 5

Liquid transmit pressure equally in all the directions. This is according to

Answer 5

Pascal’s Law

Question 6

If 850 kg liquid occupies volume of one cubic meter, then 0.85 represents its

Answer 6

specific gravity

Question 7

Pressure of the order of 10’’ Torr can be measured by

Answer 7

Ionization gauge

Question 8

The rise or depression of liquid in a tube due to surface tension will _______ with an increase in size of tube

Answer 8

Decrease

Question 9

Which of the following is the unit of kinematic viscosity?

Answer 9

Stoke

Question 10

A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will

Answer 10

Increase

Question 11

Choose the wrong statement:
A. For stability of floating cylinders or spheres, the e.g. of body must lie below the center of buoyancy
B. All floating bodies are stable
C. If e.g. and center of buoyancy coincide, the submerged body must lie at neutral equilibrium for all positions.
D. For stability of a submerged body, the center of gravity of body must lie directly below the center of buoyancy

Answer 11

All floating bodies are stable

Question 12

A body floats in stable equilibrium
A. When its e.g. is below its center of buoyancy
B. When its metacentric height is zero
C. Metacenter has nothing to do with position of e.g. for determining stability
D. When the metacenter is above e.g.

Answer 12

When the metacenter is above e.g.

Question 13

Which of the following manometer has highest sensitivity?
A. Inclined U-tube
B. U-tube with water
C. Displacement type
D. Micro-manometer with water

Answer 13

Micro-manometer with water

Question 14

The density of water is 1000 kg/m^3 at
A. 0 K
B. 20 degrees celsius
C. 4 degrees celsius
D. 0 degrees celsius

Answer 14

4 degrees celsius

Question 15

The bulk modulus of elasticity
A. is large when fluid is more compressible
B. increases with pressure
C. is directly proportional to flow
D. has the dimensions of pressure

Answer 15

Increases with pressure

Question 16

Ratio of inertia force to surface tension is known as
A. Froude Number
B. Reynold’s Number
C. Weber’s Number
D. Mach Number

Answer 16

Weber’s Number

Question 17

The resultant of all normal pressure acts
A. vertically upwards
B. Vertically downwards
C. At center of pressure
D. At metacenter

Answer 17

Vertically upwards

Question 18

A pressure 25m of head of water is equal to
A. 2.5kNm^2
B. 245 kNm^2
C. 25 kNm^2
D. 2500 kNm^2

Answer 18

245 kNm^2

Question 19

The property of fluid by virtue of which it offers resistance to shear is called _______

Answer 19

viscosity

Question 20

In an isothermal atmosphere, the pressure:
A. increases exponentially with elevation
B. varies in the same way as the density
C. decreases linearly with elevation
D. remains constant

Answer 20

Varies in the same way as the density

Question 21

The vapor pressure over the concave surface is
A. None of the above
B. Greater than the vapor pressure over the plane surface
C. Less man the vapour pressure over the plane surface
D. Equal to the vapour pressure over the plane surface

Answer 21

Less man the vapour pressure over the plane surface